Holly met Genki when trying to unlock a disk and getting him instead of a monster. Holly and Genki have a good relationship. They both care about each other a lot and of course everyone else. Holly is just so kind and caring, it's hard not to like her!
When Holly was little, her Father had to leave the town because he lost the election. She lived with the Mayor then and played with the monsters in the town. She terribly missed her Father though. When she was up at a cliff area the Mayor came up and saw all of the pebbles around there glowing. It was because of Holly's powers. When Holly was older she unlocked Suezo and a couple years after that, the tragedy came.
Naga and other baddies came and attacked the village. The Mayor gave Holly her father's stone and made her stay in a cellar area.
After when Holly came out, all the monsters were turned Lost Disks. The town was destroyed. Holly found the Mayor, but he was dying. He told her of her mission, to find the Phoenix. Holly and Suezo then went on their way, to find the Phoenix, stop Moo, revive all the lost disks, and to turn all of the baddies back to goodies, all of that with the Phoenix.
Later on Moo finds out about Holly and he takes her away to his floating castle. He tells her who he really is and gives her her fathers dagger and then asks Holly to join him. Holly just keeps screaming "No!". Genki and the others manage to save her but she doesn't tell them the truth about Moo.
